# # 导入turtle包的所有内容:
# from turtle import *

# # 设置笔刷宽度:
# width(4)

# # 前进:
# forward(200)
# # 右转90度:
# right(90)

# # 笔刷颜色:
# pencolor('yellow')
# forward(100)
# right(90)

# pencolor('orange')
# forward(200)
# right(90)

# pencolor('purple')
# forward(100)
# right(90)

# # 调用done()使得窗口等待被关闭，否则将立刻关闭窗口:
# done()



# from turtle import *

# def drawStar(x, y):
#     pu()
#     goto(x, y)
#     pd()
#     # set heading: 0
#     seth(0)
#     for i in range(5):
#         fd(40)
#         rt(144)

# for x in range(0, 250, 50):
#     drawStar(x, 0)

# done()



# from turtle import *

# # 设置色彩模式是RGB:
# colormode(255)

# lt(90)

# lv = 14
# l = 120
# s = 45

# width(lv)

# # 初始化RGB颜色:
# r = 0
# g = 0
# b = 0
# pencolor(r, g, b)

# penup()
# bk(l)
# pendown()
# fd(l)

# def draw_tree(l, level):
#     global r, g, b
#     # save the current pen width
#     w = width()

#     # narrow the pen width
#     width(w * 3.0 / 4.0)
#     # set color:
#     r = r + 1
#     g = g + 2
#     b = b + 3
#     pencolor(r % 200, g % 200, b % 200)

#     l = 3.0 / 4.0 * l

#     lt(s)
#     fd(l)

#     if level < lv:
#         draw_tree(l, level + 1)
#     bk(l)
#     rt(2 * s)
#     fd(l)

#     if level < lv:
#         draw_tree(l, level + 1)
#     bk(l)
#     lt(s)

#     # restore the previous pen width
#     width(w)

# speed("fastest")

# draw_tree(l, 4)

# done()



